Method and an apparatus for the manufacture of a bituminous coating sheet and such coating sheet

Abstract

A method of manufacturing a bituminous coating sheet, wherein a bitumen-impregnated core material provided with a layer of backface bitumen is caused to be in contact with one or more rotating bodies during the manufacture. A slip material dispersed/emulsified or dissolved in a liquid is applied onto the bituminous backface layer on the side that is to be brought into contact with a rotating body; and that the liquid is evaporated prior to contact with the rotating body; and that subsequently a further bituminous layer is applied onto the side which is provided with said slip material.

What is claimed is:  
     
       1. A method of manufacturing a bituminous coating sheet, wherein a bitumen-impregnated core material is provided with a layer of backface bitumen and wherein a slip material is applied on said backface bitumen in a slip material application station, said bitumen-impregnated core material with said backface bitumen and said slip material being further advanced in contact with one or more rotating bodies during manufacture, said slip material preventing said backface bitumen on said bitumen-impregnated core material from sticking to said rotating bodies during said further advancement, said method including the steps of 
       a) preparing a dispersion of said slip material in a liquid,  
       b) applying said dispersion on said layer of backface bitumen on said bitumen-impregnated core material in said slip material application station,  
       c) evaporating said liquid prior to said contact with said rotating bodies thereby cooling said backface bitumen and leaving said slip material on said backface bitumen, said bitumen-impregnated core material with said layer of backface bitumen having a temperature ranging between 100° C. and 200° C. when applying said dispersion and providing energy for evaporating said liquid, and  
       d) applying a further bituminous layer on said slip material on said layer of backface bitumen following said slip material making contact with said rotating bodies.  
     
     
       2. A method according to  claim 1 , wherein said dispersion is applied by spraying. 
     
     
       3. A method according to  claim 1 , wherein said bitumen-impregnated core material with said backface bitumen layer has a temperature ranging between 120° C. and 160° C. when applying said dispersion. 
     
     
       4. A method according to  claim 1 , wherein said slip material is a polymer material. 
     
     
       5. A method according to  claim 1 , wherein said slip material is a thermoplastic polymer material. 
     
     
       6. An apparatus for exercising the method according to  claim 1  comprising rotating bodies for conveying said coating sheet and a slip material application station for applying said dispersion on said layer of backface bitumen. 
     
     
       7. An apparatus according to  claim 6 , wherein said slip material application station consists of one or more nozzles to which said dispersion is supplied under pressure. 
     
     
       8. An apparatus according to  claim 6 , wherein said slip material application station is arranged at a distance from a first of said rotating bodies so that the liquid contents of said dispersion is evaporated prior to said coating sheet contacting said rotating body. 
     
     
       9. A method of manufacturing a bituminous coating sheet, wherein a bitumen-impregnated core material is provided with a layer of backface bitumen and wherein a slip material is applied on said backface bitumen in a slip material application station, said bitumen-impregnated core material with said backface bitumen and said slip material being further advanced in contact with one or more rotating bodies during manufacture, said slip material preventing said backface bitumen on said bitumen-impregnated core material from sticking to said rotating bodies during said further advancement, said method including the steps of 
       a) preparing an emulsion of said slip material in a liquid,  
       b) applying said emulsion on said layer of backface bitumen on said bitumen-impregnated core material in said slip material application station,  
       c) evaporating said liquid prior to said contact with said rotating bodies thereby cooling said backface bitumen and leaving said slip material on said backface bitumen, said bitumen-impregnated core material with said layer of backface bitumen having a temperature ranging between 100° C. and 200° C. when applying said emulsion and providing energy for evaporating said liquid, and  
       d) applying a further bituminous layer on said layer of said slip material applied on said layer of backface bitumen following said layer of slip material making contact with said rotating bodies.  
     
     
       10. A method according to  claim 9 , wherein said emulsion is applied by spraying. 
     
     
       11. A method according to  claim 9 , wherein said bitumen-impregnated core material with said layer of backface bitumen has a temperature ranging between 120° C. and 160° C. when applying said dispersion. 
     
     
       12. A method according to  claim 9 , wherein said slip material is a polymer material. 
     
     
       13. A method according to  claim 9 , wherein said slip material is a thermoplastic polymer material. 
     
     
       14. An apparatus for exercising the method according to  claim 9  comprising rotating bodies for conveying said coating sheet and a slip material application station for applying said emulsion on said layer of backface bitumen. 
     
     
       15. An apparatus according to  claim 14 , wherein said slip material application station consists of one or more nozzles to which said emulsion is supplied under pressure. 
     
     
       16. An apparatus according to  claim 14 , wherein said slip material application station is arranged at a distance from a first of said rotating bodies so that the liquid contents of said emulsion is evaporated prior to said coating sheet contacting said rotating body. 
     
     
       17. A method of manufacturing a bituminous coating sheet, wherein a bitumen-impregnated core material is provided with a layer of backface bitumen and wherein a slip material is applied on said backface bitumen in a slip material application station, said bitumen-impregnated core material with said backface bitumen and said slip material being further advanced in contact with one or more rotating bodies during manufacture, said slip material preventing said backface bitumen on said bitumen-impregnated core material from sticking to said rotating bodies during said further advancement, said method including the steps of 
       a) preparing a solution of said slip material in a liquid,  
       b) applying said solution on said layer of backface bitumen on said bitumen-impregnated core material in said slip material application station,  
       c) evaporating said liquid prior to said contact with said rotating bodies thereby cooling said backface bitumen and leaving said slip material on said backface bitumen, said bitumen-impregnated core material with said layer of backface bitumen having a temperature ranging between 100° C. and 200° C. when applying said solution and providing energy for evaporating said liquid, and  
       d) applying a further bituminous layer on said layer of said slip material applied on said layer of backface bitumen following said layer of slip material making contact with said rotating bodies.  
     
     
       18. A method according to  claim 17 , wherein said solution is applied by spraying. 
     
     
       19. A method according to  claim 17 , wherein said bitumen impregnated core material with said backface bitumen layer has a temperature ranging between 120° C. and 160° C. when applying said solution. 
     
     
       20. A method according to  claim 17 , wherein said slip material is a polymer material. 
     
     
       21. A method according to  claim 17 , wherein said slip material is a thermoplastic polymer material. 
     
     
       22. An apparatus for exercising the method according to  claim 17  comprising rotating bodies for conveying said coating sheet and a slip material application station for applying said solution on said layer of backface bitumen. 
     
     
       23. An apparatus according to  claim 22 , wherein said slip material application station consists of one or more nozzles to which said solution is supplied under pressure. 
     
     
       24. An apparatus according to  claim 22 , wherein said slip material application station is arranged at a distance from a first of said rotating bodies so that the liquid contents of said dispersion is evaporated prior to said coating sheet contacting said first rotating body.